At the moment it is not possible to create an organization contact (orgContact) via Microsoft Graph.
Our customer now wants to synchronize their Business Central Cloud distribution lists (mailing groups) with the Exchange distribution group.
For this we need an endpoint for the creation of the contacts (organization Contact). Also we need to manage the distributation groups in Exchange, which is also currently not possible.
Something similar was posted in March this year and was marked as completed. I think this feature is not fully implemented and should not be marked as completed.